LSJ
ατος, τό, that which is eaten with bread, IG 7.2712.81 (Acraephia).
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
τό, das zum Brot Genossene, die Zukost, Inscr. I p. 791. Vgl. ὄψον.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)